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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724444ed320352640a67cdf87a8d7316094b046ff722ddc7c361db077572b2ef' 
  AND token = 'zGdQJSy6f7Rgqx7dst4gtVdY0nRuxv4ihaj/Cq/xCTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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