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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d74c23ced4a14778fadd1d58da9f9089b8e94f9312843bf9d7555b56317aeb0' 
  AND token = '1brnyYM5geuUUyZEpQGYDzeLYI1oo58X9wF/quZprfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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