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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd486107ecbe1de6bfb70620213700cc5566069aeb5df8ca80f8795e3687fdb04' 
  AND token = 'de85yP7ofW2qbR0TAjUQHyYgXN0gyH/oM3a0rKRzBtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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