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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70827882a0a4f8906b23f0ddc4f403e96f4b9cc5e164742cc6ff20bcdf01224c' 
  AND token = 'lMDOk3nmbUg2a0wUEklOUk9T9P57tq4TqDF13DnDJbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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