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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd26c075899a6120ded9d436d1cbc124f32db92f155c7db8a2caaa61a5ec4ab' 
  AND token = 'WIJ4KXAuWPY/BqgtS3y6OQdBUCKYU7IJdWfSQtnjaHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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