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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85595d30f562b7fcb1c09e2c2b335a497355f84f1278747c95070be554839d0' 
  AND token = 'e4moYzbd99u5GpC2qLQ979uVCO+8k9iXHeoE4SG8uCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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