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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbca5d36341cc8b313dd1340ccf22a93a5956f1d2da42cb5b5312ca497d76bd1' 
  AND token = 'y0BjAdOKo8InqhLLe96xwpetOKBNdOEfUH+Mk+ftLUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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