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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4c78128749313dad8745cf34ef26c057b0c17b8279b502738c8cf959426f5e' 
  AND token = '/3N9CQmn7OxfbQhk4fF4M74BijR6dziqQR0tJYfg1lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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