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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2303c9bfcf6ccd46a027b92f5ffbb6a0a378868a23878afac4c9e757252cbd39' 
  AND token = 'aqmkCPc6e2R2Vd3VH5SrBYWWeVDuQtVuRP1r0FDU3Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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