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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1067ad4ce6678164b2ea238068c1a8673ce54028a829fee4f246bb0fa5af5bea' 
  AND token = 'FtjRP5a6l28lyfKXb3Wfde/vAxAgriH9vdpbHI38l7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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