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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf64919c09fd8114a98db77c8e440a42fca5716668f3c0e7bff7d7bcb187e4aa' 
  AND token = 'E2njzztJzsqn1LAk/36sm6CYXRlJBy6EFT5imRXNuRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}