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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd25051d6804ce3835f3c1efdb4f50627437b6357c9f1b9a8703643152501c5' 
  AND token = 'a7Ku8uQ84D16AsKtJb7yWnod9ppFJhyCScZkBdSW3Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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