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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d9f779cc2b1adb63c0a42c88b23f870824c1541540be02e99902c0b96a1dff' 
  AND token = 'zP8zAbmwoB7ScJ5HOeEP/cvBhTL3XgvkKcSbz7cLCpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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