SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7026268d321d9722ede0d3c089c703d11120719559fced3ee7ba1239553b3148' 
  AND token = '/9YgQxxG5qkjOH0GxsLAERXZFXImKfo5v/wChbajgmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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