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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa93f4e7152c645316382a331381b5ad307f715b165f3275fa3948fd343985b' 
  AND token = '0kQla45SD4v2xZTXGmQn2v/Btge8zZYAd/M+/Yr76WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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