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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f370d6d25ba2b2d9bf7b5dd7f4df2680014a775119a0b9acc3a7fb0e97680965' 
  AND token = 'bMQK1AKpEd6EsloVuL7Gwks1ku/WXtbZhuS1ycbUL7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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