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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa70b8402a2e15e7881c3ead26657a4877ad484e7c2bb6db6e27eb0d3fd0e6b' 
  AND token = 'J+sFLmaOk9l9/L7aJxnB2xnA6+iwiwGlHyayTilBZUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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