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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2cb4aa8170940e52a3e7a55be68ec1130dee2e2c21760f4b02a804ea20ff44' 
  AND token = 'wPmw+RkDaqPUvWj2vpMS4SJ1FyHyac4xC/NGhZR/kMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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