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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a78568a1a52d5c548f8c3a822144986fa359a5b332dc2a6cccafa943194840' 
  AND token = 'VmTvTfWp93A1nqu6KnHKaf3VsWCwKVh3PpDUGkqjGq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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