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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d836306b84a75fe20c6dce2656d12a03efa7c0f7a604a577f58575d0ccfc39f' 
  AND token = '8GFoIGESYr9mPBs0RC6nxdBOp2WtDlP69vGBX0hDABU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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