SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e25aa66d063d392ebdf8d49bf5d099817cf114ae57f203546c3df8276866e7' 
  AND token = 'lshH2qCh3oOSJBRT3HpzHIP8mNVRRRclnbcwF/rgEvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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