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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29847407aab8694e9414fed45a500cd95b9b2ef1939e81b81f26a6f64e5666c0' 
  AND token = 'kUa3nxEIx2/kSSS4i6xJh38FyjJ3X4pm8GD5iENMW0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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