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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5790569acf57537df2c017049b3ebb8b8876932c4e119b354b7fc53d91b9ed79' 
  AND token = '9AL2AtuGXCQ99Tzph6sPXWe1fz2NI68mAtJ7VWbO8A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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