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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8815bc5273686cfe5f98ce064ef851d530de049f937df283ec6735dbac6779c6' 
  AND token = '3z3s0rEltoc/NkSiFWbtn7ZR4bSy+4nIYTV3/FKdnQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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