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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9993da2c4e76784c803ef68f8d483fc5d004c64a1dfe31db0460decfe9fa0ed0' 
  AND token = 'uU5gc+LXO9hd0074H3WmbXO0nJoZV6EhUAz7ItB1928=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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