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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc801b77f8193e1abf312187be667327c4dd3a8d2beb6bec8a959dbfb23b5bc' 
  AND token = 'vO/gjg3m0rxDl9SPXKfkyDf8b/STQtKPlkCzpgwqWJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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