SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a5528851ef3f38e12d5332d72b873db380c54aef41546d5b0cdf5297cb0f15' 
  AND token = 'K9uFvtwa4M2C0+54dBjxSHJ7L6BmiBstIqwkgfW/Cp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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