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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc987edc086d99833f565520615c07132f2efbd6a9705f79e7e39f2019ec65a' 
  AND token = 'sL40eVUbOyvM9NbS76jVMOJmw5peQIU8RyWZDBDdRtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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