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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d3d8d08d81f8bb3d604ac76a56840bb100f79d2382a5c11ceae13db902c0d7' 
  AND token = '6y42TsSgWdZN7nVf7M9pwYvSyRx4Q4mhtL6nHbJT+uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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