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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c3e7a631ca6cf98ac6eb8704409e5a18d5d7d9ee9c7ff41a477a46c0453472' 
  AND token = 'kF3GIBK6RvAHxsx31i2rTj/IbAwlqfA/zT5b+u0/YAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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