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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34216c8d394a7be871060f92bc3361db1720b348001b6f674926d9ac879f87b' 
  AND token = 'wERJI7Efz4xlCL4ljnCEgKtS8XhrsZYuIje4pwKNifY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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