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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e68613fb5b5623e22b4488422aa69867ce3617c7c7aa96dcd05dece0355a1a6' 
  AND token = 'oLj7WW5uT3rjDZ42hv451W6qk7khZruKve1ZleYYeT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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