SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0fce7c1d9599d478e82f687fb431ddde046f143f3d6659f15788a398dcbe59b' 
  AND token = 'AnDKKHtqhUBFdq3g2U1UOkn/3hoDYvwl+THBX5jehZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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