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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56cfc05b18adcf50f79ac2f84900652d6195f90680a259403917980b2980e89f' 
  AND token = 'Cb5PpbQaqMy+P/xVSKSpbcF3Kw4CFUV3s8cOuMvJRUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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