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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58ea23513eacdc8fc4a9f1c1f279e3f597ab63961dbb7177de5babbdeac0ef6' 
  AND token = '/Ty4/dY0M6CeRen1KTyV4NUPNyVtNPETgqjoEmmn0CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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