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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a441424c4cab9468645657fd4fc69afd4bde37726b53c11f6f7de21fe7766b26' 
  AND token = 'qzqQSl59iZSLx7VYpd7EM83Gby69RL2GszoB9YaIMXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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