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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d9e9e5aa8bbb0879aa20e285d8fea1d6abcc6b6464fab6c79badb94e577cdd' 
  AND token = 'ntOf61Q3DBmjKprFpiNPLKcs1NokOGrUIz5NxzbPBk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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