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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe9294433f3fd31329b117183d58e33658e8fdbf029c00d5f177b8ab87ac718' 
  AND token = 'SDINrgDQz4+V365xmusMuTb3ove2bgaGl1GtEClbw6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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