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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1246e606ab9797e75d957f45c7e0ca74ea3c1e8814017861cb63265bd263226b' 
  AND token = 'UcugHJOn+bmj8ESJKWSAtb/goNs3Qifirl7p3oaKysw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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