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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f88bec92f617d6674b68ade0e9f6d1eceb3979c6757afcdb1d536130f7deb87' 
  AND token = 'zqnbf6LmVA3E4ol+0Bt1rVnbN4ZTt6ORL8VC1tPVU0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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