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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc76a9490c030d858badcb1be8e9498e6b709042a48a99e81baa881ff65c36e' 
  AND token = 'av3zxCecvPCstHRrWJk/i8Fz448NEYIkwNgscPNevdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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