SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8809bc8e14747f027d03c5e9426875664282995fd41bb04bac82857204ba55c6' 
  AND token = 'cgE3OPBUPwcrvAKqH5rhAEXG4GGLJCUsYz8njLB3qL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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