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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3824fcab76bb0aacd41e21ce81830526bbb64936cfea0726138d943c0ac626c7' 
  AND token = '1PtcS9VcYJcqnWlO4LKlkUjvn4UfLDDHo3Vxguc1p6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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