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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f3784fa15e36ead4dc0fd4ba6a02fc64e6279dc54bc841d0d77fcb82b7f6a4' 
  AND token = 'ZfLsrjJcZwY9x2JSxQX8s7FwK0hbIgeUKiUQEPyDwaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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