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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e8b38350da3f86eedd32551b352f572b16bd222216887a7cbd038230637ed84' 
  AND token = 'PEb88B9E2k4n4dErGe1MToN8wv/kqOXVaKBaS6yWOFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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