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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d8267db62b1daf41dbda76681fd209ea4e5a446d3f7edab912ad552e5adb80a' 
  AND token = 'qYVGpUACUiubuAJhYO0QQ9w2DTqt8112spPQAWG6ZYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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