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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ef12e8a8fd6d8b7bc65f99bfbbf4c12b4e724352ddeb1b9620ab3f2c64eab6' 
  AND token = 'jq7EtngmWrz9JAT+nP4DToATXo8NmghFHwrBR5EqBbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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