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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893a581affcab06b6464533727c9faad2a98b37ff3fdd61c438c194045e746eb' 
  AND token = 'bjzRH7wFIpmat3pc5IHKJBQDpNny4bc762e26deRD7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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