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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06918851aa7ff24ff45ace152b077fa78ba495df1b49af8aea58b0f9ad7c64e' 
  AND token = 'GdE/Sk3iQVixlLhGIDrXa/R2nCPO678xL29mr3pdOmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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