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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297a5b2381e335c90dfad74adf4d8d8698ea3c2a505d93aa4fd6385b023c70ed' 
  AND token = 'kiMDCHW9DGq3LmL9UB90P/hVHnWK6G1npvh2+M5D6Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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