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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38baf5b099c6ff3cdf19ef1e84cb6c200a43438263750def6d5ac8ed52392c90' 
  AND token = 'b+W71oELyyhtPKaF5TPqqiE+tuD5g6VnYWSQ63DZoIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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