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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a614a678b76b7636e86897b21861158202061689272b6006f60c17b43d3794' 
  AND token = 'dRPOz2k1UGImXLgSS1fVOkZ4iDdBQ7l9WqKf9DflT+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00480

JSON explain

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