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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fad04d6c014b4174ebb245f2a4ade7103dd6d0338a21d46921ffbe8d0dc075d' 
  AND token = 'szn9whaHs6l3vvgTYvVVkMQvs+BFeFFqkwsqozsFwfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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