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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69db1060b6409672a73268ee0d4e178a3cf0152d3c76eec087454bf7e7232aa6' 
  AND token = 'oBJm3EmQ8b+4McJIGkqwmdURHQo73l1YmeP8zy/dC6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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