SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65fa1bd7c9b6a9d20879b0fd7fd796c39c1a2516738158be525da0368943690a' 
  AND token = 'dRAjFJlThwA/Vx1HgT/m/dPYCmVYwq4XjKuFqVQ03wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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