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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9a88f2a373356786aa9c5d01bb6a186a6cc7c9751fa93f45af221ea8f389df' 
  AND token = 'E1/wuMo3fj0xiaiyTBQ2hCQHlyL6vwb2RmCtJOJYmrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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