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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d36e61508a0686cb70ea7b503b8c83c07b6cfce83483f118e53ccca6372df9e' 
  AND token = 'Nst8ggE2o1ltvI3zC7o7vYnnf0suRdWCPskzSlv5xEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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