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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6113bfc49ee907cdc6bda9aaf05cc0b67f5f1eb9b3e82125b39a90f7d7e47e' 
  AND token = '7RZnEA/YFKQLupThNMT1AxSitZHWRa1nM+TBbbDQgnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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