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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b92318bb4dcc0d5c845b72ef06d30472d91cf17b226c7834928ffca0101fe96' 
  AND token = 'k6CxWKmqzRTcgc1rZrEN/1B9YFAsJvx6Fd/vxFO3+yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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