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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8ab3299b0415bc81e1c5d2f64afbeffef10040e4eb0b545b75cb9e0d646542' 
  AND token = '7swXnMSs7QQhUjahDPkm5RN02IKxaBzcfi4zczHmFJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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