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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6823f936d8fa75efa7f1a7f6e3e97538999cc3b77694fe22728f600b2f6ddb76' 
  AND token = '4pJOePqb+aVNJSjsagJtl8dUJ9/Y69vXwH4Ax0HujR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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