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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4404f1dac8f0bf3c40867454be98c871748cd2492c2b81b35fc890aa18407cc3' 
  AND token = 'P9Mb4eajlzZ2bU6z/i2S1jWphdecovABQjyGcKeKUs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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