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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74efc3679e89ff8a07be48264f96a8031cbf887a95a277df2f49dd30dad673fb' 
  AND token = 'gED7MIXzi/YdxtOW563HPrh8VMUTYaE5cTNramAUUA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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