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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b79c63bf40d301838ce9042d9b59e08a4e4d8afa9bc52179e2774fa2e4a50c6' 
  AND token = 'QybH/RdcymrfESaN++M0l273dfepbMWcKfHzUJBKO7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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