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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e292b11822c5261275ab6453f0372fa6337a8264830fc22ab8c27331a6cdac' 
  AND token = 'GzueZ/4W4fjsi6QVeeWyUNV5RC6bS2ZAVS0J/DcHIGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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