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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acebf74cac9c4368faaefeb4f6bc18c8971589e034cf9febd25ff33f976b64e8' 
  AND token = 'rSQbDbmi/R8d9/O2BZ75YIu28epNdBvPFM0mQuwbyI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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