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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b226e78ded572a93f130ae5fd0e854f1a965f70bf768d3a7e01878da59294b45' 
  AND token = 'Y4QAs+8oW0DxS70rq0Xoy3Pi1sqoNB9YueAW6VK8jns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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