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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f13f1e0ea3697502a01fcaec771a798eb3841b5d64477a482f57a084865b45' 
  AND token = 'EV7TUhvGiwNH68toLw0e282BU7Artds2h/ti4AadTBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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