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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd869b6ba610dfa1ca379e33557562e26482fe57767ba2f138c7eecbe4d092335' 
  AND token = 'ZsMsURlg1wbgEKgE1DqPBt10YKWkYYH1IkBwVPYOq0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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