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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125634bd6b532b518cce047b6dbb948131a08c08c635c8bd5126204e0d7f8729' 
  AND token = 'thAevsZXxrxou6COMb1rzdBjN7RzYy3E3a/xlaA2NDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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