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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d34fe7b9b6d98e88d2acd5ed2a71a34879d1213b960792bc15568ac90811c0a' 
  AND token = 'OhIniH/fJVFum55Oa3l6lMrEXVMd3hORK2w3qaTIFt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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