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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1cc03bc6676d7c43d939963f7fbb6cd1b234f510a392b45d4bbfd4b572280d4' 
  AND token = 'oL5JdjLZffdd/ryO17hw8mlXZfT39cQtVZWjnzXMi7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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