Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b56860d7326ceea77f9315c8c2d39cd7ed773da53c0baebaca06dc53a2c0bc' 
  AND token = '4ssf4LO2IDLxwg+RFEiQi4rSy2lJV19mDDzMXlyDl4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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