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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea3f11a09b0ab06ddb4ed3d0d2ab1cbdf60118b5b77b101896ce73c4a7a1449' 
  AND token = 'mi3wzX1ajz1hgfpbQ4iXuBS9Z9p6XK3AaSxVDo0U630=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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