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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a9d4e17c5e5e89ee4d00a5639220cc81a4e8798ddd3293aa61028a922e0c57' 
  AND token = 'z/wof7B9qloDMqcEuL1M/aXG5oMN7zArV05gAN0DoKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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