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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b54ff9628aa3d5a8167ecf4a13840b8d0f1b95e7a26a3ccdd66d4d109416a848' 
  AND token = 'M7M7vMnuX3VQbOoPoEGuzRx1xMs1/wphS3PkwhnawDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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