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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20253a230fb17856edcb12621044295af15be074a7311249ba2782f6c545277' 
  AND token = 'd1eLxZZeX9ggcHbFW1HpEyFdESpgfFGw0XVN/JJQbFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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